In a conversation about the importance of User Experience in times of Big Data with Sebastian Ullherr, Creative Director at interfacewerk:

What do you understand by User Experience (UX)?

User Experience (UX) is a term in software development and goes way beyond User Interfache Design (UI), the design method established in our industry at the moment. While UI designs aims at solving the problem as easily as possible UX asks the question how well the software will be able to solve a problem in the real world. That is why UX designers often are also product designers as they have to ask the question who will use the product and which problem should be solved by it. Usability is therefore a part of UX because only user-friendly solutions can solve problems efficiently.